.nav_1 {
  position: sticky;
  bottom: 500px;
  width: 961px;
  height: 30px;
  border-bottom: 1px solid #e2e2e2;
  margin-top: 45px;
  margin-left: 160px;
  /* background-color: pink; */
}

.nav_1 li {
  float: left;
  padding-right: 68px;
}
.nav_1 li .art {
  position: relative;
  /* 1.透视 500 近大远小 */
  perspective: 500px;
  width: 120px;
  height: 30px;
  /* 3.开启3D */
  transform-style: preserve-3d;
  /* 2.加个过度 */
  transition: all 0.3s;
}
.nav_1 li .art:hover {
  transform: rotateX(90deg);
}
.nav_1 .art .front,
.nav_1 .art .back {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}
.nav_1 .art .front {
  /* Z轴 高的一半 正值往自己方向 */
  transform: translateZ(15px);
  /* background-color: pink; */
}
.nav_1 .art .back {
  /* 切记一定要先移动在旋转  Y轴移动高的一半 X轴旋转90度 负值往返方向 */
  transform: translateY(15px) rotateX(-90deg);
  /* background-color: purple; */
}
.nav_1 li a {
  display: block;
  font-size: 16px;
  line-height: 30px;
  color: #030303;
  text-align: center;
}
.nav_1 li a:hover {
  background-color: #83bb34;
}
.abroad {
  width: 961px;
  height: 223px;
  /* background-color: skyblue; */
  margin-top: 30px;
  margin-left: 160px;
  border-bottom: 1px solid #e2e2e2;
  transition: all 0.3s;
}
.abroad:hover {
  box-shadow: 5px 10px 15px #7f7f7f;
  transform: scale(1.02);
}
.abroad h2 {
  font-size: 22px;
  font-weight: 400;
  margin-bottom: 20px;
}
.abroad h2:hover {
  color: #83bb34;
}
.abroad img {
  margin-right: 30px;
}
.abroad span {
  font-size: 14px;
  color: #727272;
  vertical-align: top;
}
